VMS Help POSIX Threads, PTHREAD routines, pthread_condattr_destroy, Description  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    This routine destroys the specified condition variable attributes
    object. Call this routine when a condition variable attributes
    object will no longer be referenced.

    Condition variables that were created using this attributes
    object are not affected by the destruction of the condition
    variable attributes object.

    The results of calling this routine are unpredictable if the
    value specified by the attr argument refers to a condition
    variable attributes object that does not exist.